Just by chance, I drove past a sandwich board advertising a free wash to Audi drivers. I hummed and hawed, but decided to give it a shot. The "detailers" used a high pressure steam machine and waffle weave towels. Their process did result in some swirl marks in certain areas. They were particularly noticeable on the rear deck. For a "professional" detailing outfit, they should be more skilled in washing a car - you would think. I have a major polish forthcoming, so I will be sure to do some before/after shots. Anyway, it was a cool idea on the part of the Audi dealership that sponsored it.